Grit on bare metal

Joined
May 31, 2017
Messages
23
Location
Malaysia
Hi folks.

regards to bodywork paint topic.

Can you pls advice:

I have a car panel that's brought down to bare metal using 40grit. Now it has 40grit scratches. NO bodywork or fillers required. Just 1k or 2k primer and paint.
Question: Do I need to sand the bare metal further with 80 right up to 240 grit before spraying the primer?

the purpose is for the primer to have good mechanical adhesion but also not not show scrarch marks through the paint later in on.

what should do use
thanks
 
Yeah. it's a car panel. Thx for the reply.

So Im guessing I should progressively sand the bare metal panel frm the current 40grit marks up to 320grit.
Then clean the panel with wax n oil degreaser, then it should be good for primer.



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No point in removing too much metal, surface scratches are not removed at that level they are removed by "blocking" the primer.
Go over it lightly with 80 grit no finer that that for better adhesion, prep sol it and a final wipe with alcohol then use a quality DTM/Epoxy primer follower directly by a couple of heavy coats poly primer.

Let this cure a few days for best results, the primer show the 80 scratches but now you can work them out with finer paper without removing any metal. Work it down with 400 and water and finally 800 and water (a couple of drops of dawn will help keep the paper from loading up) so its like glass then you can spray color or color/clear depending on the type of paint.
Do not use a talc based primer directly over the metal or go cheap on the primers, spending the money here will pay dividends over the years.


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Originally Posted by Trav
No point in removing too much metal, surface scratches are not removed at that level they are removed by "blocking" the primer.
Go over it lightly with 80 grit no finer that that for better adhesion, prep sol it and a final wipe with alcohol then use a quality DTM/Epoxy primer follower directly by a couple of heavy coats poly primer.

Let this cure a few days for best results, the primer show the 80 scratches but now you can work them out with finer paper without removing any metal. Work it down with 400 and water and finally 800 and water (a couple of drops of dawn will help keep the paper from loading up) so its like glass then you can spray color or color/clear depending on the type of paint.
Do not use a talc based primer directly over the metal or go cheap on the primers, spending the money here will pay dividends over the years.


49.gif






This.
 
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